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Current research networks allow end users to build their own application-specific connections (lightpaths) and Optical Private Networks (OPNs). This requires a clear communication between the requesting application and the network. The Network Description Language (NDL) is a vocabulary designed to describe optical networks based on the Resource Description Framework (RDF). These descriptions aid applications in querying the capabilities of the network and allow them to clearly express requests to the network. This article introduces NDL and shows its current applications in optical research networks.

The research networking community has embraced novel network architectures to provide e-Science applications with dedicated connections instead of shared links. IP and optical services converge in these new infrastructures to form hybrid networks. Lightpaths are the services offered to clients in the optical portion of the network. They are chosen because they guarantee the appropriate QoS in terms of bandwidth and latency.NDL -the Network Description Language -is a data model offering users and providers of lightpaths with a common ontology to describe topology information of hybrid optical networks. The strength of NDL is that it supports a wide range of applications, including pathfinding, visualisation and asset management, via the definition of a common data model to exchange network descriptions. Since NDL is based on the Semantic Web techniques, it is straightforward to relate NDL with application-specific ontologies. In this paper we present the current status of the NDL schemas and its use in several applications.

Status of this Memo This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited.

This document defines the scenarios in which IPv6 transition mechanisms are to be used in unmanaged networks. In order to evaluate the suitability of these mechanisms, we need to define the scenarios in which these mechanisms have to be used. One specific scope is the "unmanaged network", which typically corresponds to a home or small office network. The scenarios are specific to a single subnet, and are defined in terms of IP connectivity supported by the gateway and the Internet Service Provider (ISP). We first examine the generic requirements of four classes of applications: local, client, peer to peer and server. Then, for each scenario, we infer transition requirements by analyzing the needs for smooth migration of applications from IPv4 to IPv6. Unmanaged Networks IPv6 Transition Scenarios

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Large scale data intensive science requires global collaboration and sophisticated high capacity data management. Traditionally, mismatches between the requirements of large scale science and the restrictions of generally deployed networks have been problematic. However, the emergence of more flexible networking, for example, using techniques based on OpenFlow, provides opportunities to address these issues because these techniques enable a high degree of network customization and dynamic provisioning. Also, these techniques enable large scale facilities to be created that can be used to prototype new architecture, services, protocols, and technologies. Consequently, a number of research organizations in several countries with major HPC facilities have been working together to design and implement a persistent international experimental research facility that can be used to prototype, investigate, and test network innovations for large scale global science. For SC12, this international experimental network facility will be extended to from sites across the world to the conference showfloor, and it will be used to support several testbeds and to showcase a series of complementary demonstrations of techniques that could be useful to large scale science applications, including multi-domain automatic network topology discovery, virtual networking and tunneling over WANs, dynamic path provisioning using edge signaling and control, and multipath provisioning using MPTCP.